TECH: GSR ECU on an H22a!?
 

Personally I wouldn't even use this for drag racing with how bad the power falls on it's ass in the midrange... but they seem to have a different opinion...


December 16, 2001 - 18:48
Effect on H22A with GS-R ECU and H22A ECU
by Jeff Schaefer

This is an OBD1 Prelude VTEC motor with (blue line) H22A ECU, (red line) GS-R ECU. This motor does not have any Fuel controllers such as a V-AFC from ApeXi. It does a have a fuel regulator. But nothing to change VTEC with...this is your standard, low budget setup...

This is a good comparison to look at...

http://www.hstuners.com/articles/pro...22Aecutest.jpg

Blue line: H22A ECU, is the daily driver choice. The power is smooth, there is not a noticeable lag when you go up the RPM's. But the fuel is not perfect for maximum power, as you can see up top. The VTEC comes in later, on the stock ECU, so that is why its smooth....

Red line: This is the GS-R ECU. VTEC comes in earlier....so you get a HUGE lag....but after that...the power screams and in the high RPM, you have more power considerably. THis would be a better pick for drag racing, but a little uncomfortable at about 4500 RPM, because it lags. Your ripping up to 4400 RPM, then it just falls on its face...then it screams again...but its good for racing.

It should be of note that the Lag cannot be fixed with simply a V-AFC. This is so because the timing and fuel curve cannot be changed enough to make it all go away. Timing at all...What can fix this problem is a Hondata System.

The results speak clearly....

The motor has a milled head, all the bolt on's, stock cams, stock intake manifold, S pistons. Cams have the sole effect on VTEC lag....The cams are obviously too big for the GS-R ECU.

Jeff

Source: http://www.hstuners.com/news/wmview.php?ArtID=14

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what would be the purpose? the net gain was only like 10hp. the loss was the lack of any midrange.

Wish I could answer that question. :lol:

empty your mail box jeff

http://www.h22a.org/images/dynoes/slogsrecu.jpg

i dont see any 'falling flat on it's face'. they say that a vafc can't fix this problem. . . . i say it can, decent tuning can. i had a spoon vtec controller- dont see any 'falling on it's face', do ya?

also note they didnt show the a/f ratio. i'm sure everyone that drag races wants that awesome 15/1 a/f ratio, huh?

You couldn't fix your a/f with larger injectors and the fuel controller? Also, why did you make so much less power then the one recorded? Just curious. They may very well have had several things done to the motor, but it stated it was a low budget setup.

could i fix the a/f? sure. i've long since fixed the problem, but let's suppose i still had that setup.
first of all, a spoon vtec controller does just that- control vtec. it doesnt do anything to fuel. could i get bigger injectors? sure, if you wanted to do it backwards. just slapping on bigger injectors is useless without the ability to control them- at the very least, a fuel regulator. but now i've probably spent 400 dollars on upgrading the injectors on a stock motor, i'm running rich when i'm not wot, and still am not properly tuned. how much does a vafc cost? or hondata? exactly.
why do i make 'so much less power'? if you read the original post, you'll see that motor is anything but 'stock'. milled head and type-s pistons, all the bolt ons, fuel controller, and so on. doesnt sound like a stock obd1 motor to me. with maybe 11.3 to 1 compression, i dont think it's fair to compare that to my motor or to pass that motor off as what a TRULY stock h22 would do with a gsr ecu.

Yeah. If you want power you have to spend the money. I overlooked where they said they had done that much to the motor. :shrug:

the only reason they did it was for top end.

if u have vtec when u racing ur obviously going to be in it and the gsr ecu seems to get it done up top. daily driver it would be an issue like john said its hella lean down low.